include
using namespace std; int main(){
double a,b;
char c;
cin>>a>>b>>c;
if(c=='+')
{
cout<<a+b;
}
else if(c=='-')
{
cout<<a-b;
}
else if(c=='*')
{
cout<<a*b;
}
else if(c=='/')
{
printf("%.2lf",1.0*a/b);
}
else if(c==' ')
{
cout<<a*b;
}
return 0;
}